Classification of Elements and Periodicity in Properties

The correct order of increasing metallic character of Na, Be, P, Mg and Si is :

1. Be < Si < P < Mg < Na
2. P < Si < Na < Mg < Be
3. P < Si < Be < Mg < Na
4. P < Mg < Be < Si < Na

Identify the incorrect statement from the following:

1. The largest and the smallest species among Mg, Mg2+, Al and Al3+ are Al and Mg2+, respectively.
2. The IUPAC name of the element with atomic number 107 is Unnilseptium.
3. The similarity in behaviour of Li with Mg is referred to as 'diagonal relationship'.
4. The oxidation state and covalency of Al in [AlCl(H2O)5]2+ are 3 and 6 respectively.

Among the following options, the correct trend in the electron gain enthalpy is

1. I > Br > Cl > F
2. F > Cl > Br > I
3. Br > Cl > F > I
4. Cl > F > Br > I

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. In light of the above statements, choose the most appropriate answer from the options given below:

1. A is not correct but R is correct
2. Both A and R are correct and R is the correct explanation of A
3. Both A and R are correct and R is NOT the correct explanation of A
4. A is correct but R is not correct.

Which of the following statements are true? Choose the correct answer from the options given below :

1. C and D only
2. A, C, and E only
3. A, B, and E only
4. C and E only

Which among the following electronic configurations belong to main group elements? Choose the correct answer from the option given below :

1. D and E only
2. A, C and D only
3. B and E only
4. A and C only

Arrange the following elements in increasing order of first ionization enthalpy: Li, Be, B, C, N Choose the correct answer from the options given below:

1. Li < Be < B < C < N
2. Li < B < Be < C < N
3. Li < Be < C < B < N
4. Li < Be < N < B < C

Arrange the following elements in increasing order of electronegativity: N, O, F, C, Si Choose the correct answer from the options given below :

1. Si < C < N < O < F
2. Si < C < O < N < F
3. O < F < N < C < Si
4. F < O < N < C < Si

The correct decreasing order of atomic radii (pm) of Li, Be, B and C is

1. Be > Li > B > C
2. Li > Be > B > C
3. C > B > Be > Li
4. Li > C > Be > B

The element expected to form largest ion to achieve the nearest noble gas configuration is

1. F
2. N
3. Na
4. O

The IUPAC name of an element with atomic number 119 is

1. ununennium
2. unnilennium
3. unununnium
4. ununoctium

The correct order of first ionization enthalpy for the given four elements is :

1. C < F < N < O
2. C < N < F < O
3. C < N < O < F
4. C < O < N < F

If first ionization enthalpies of elements X and Y are 419 kJ mol-1 and 590 kJ mol-1, respectively and second ionization enthalpies of X and Y are 3069 kJ mol-1 and 1145 kJ mol-1, respectively. Then correct statement is :

1. Both X and Y are alkaline earth metals
2. X is an alkali metal and Y is an alkaline earth metal
3. X is an alkaline earth metal and Y is an alkali metal
4. Both X and Y are alkali metals

For the second period elements the correct increasing order of first ionization enthalpy is :

1. Li < B < Be < C < N < O < F < Ne
2. Li < Be < B < C < O < N < F < Ne
3. Li < B < Be < C < O < N < F < Ne
4. Li < Be < B < C < N < O < F < Ne

The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration ?

1. Carbon family, [Rn] 5f14 6d10 7s2 7p2
2. Oxygen family, [Rn] 5f14 6d10 7s2 7p4
3. Nitrogen family, [Rn] 5f14 6d10 7s2 7p6
4. Halogen family, [Rn] 5f14 6d10 7s2 7p5

The formation of the oxide ion, O2-(g) from oxygen atom requires first an exothermic and then an endothermic step as shown below: O(g) + e- O-(g); H = -141 kJ mol-1 O-(g) + e- O2-(g); H = +780 kJ mol-1 Thus, process of formation of O2- in gas phase is unfavourable even though O2- is isoelectronic with neon. It is due to the fact that,

1. O- ion has comparatively smaller size than oxygen atom
2. oxygen is more electronegative
3. addition of electron in oxygen results in larger size of the ion
4. electron repulsion outweighs the stability gained by achieving noble gas configuration.

The species Ar, K+ and Ca2+ contain the same number of electrons. In which order do their radii increase ?

1. Ca2+ < K+ < Ar
2. K+ < Ar < Ca2+
3. Ar < K+ < Ca2+
4. Ca2+ < Ar < K+

Which of the following orders of ionic radii is correctly represented?

1. H- > H > H+
2. Na+ > F- > O2-
3. F- > O2- > Na+
4. Al3+ > Mg2+ > N3-

Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C, Ca, Al, F and O?

1. Al < Ca < O < C < F
2. Al < O < C < Ca < F
3. C < F < O < Al < Ca
4. Ca < Al < C < O < F

Identify the wrong statement in the following.

1. Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius.
2. Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius.
3. Atomic radius of the elements increases as one moves down the first group of the periodic table.
4. Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table.

What is the value of electron gain enthalpy of Na+ if IE1 of Na = 5.1 eV?

1. -5.1 eV
2. -10.2 eV
3. +2.55 eV
4. +10.2 eV

Which of the following oxide is amphoteric?

1. SnO2
2. CaO
3. SiO2
4. CO2

Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is

1. Mg < Ca < Cl < P
2. Cl < P < Mg < Ca
3. P < Cl < Ca < Mg
4. Ca < Mg < P < Cl

Among the following which one has the highest cation to anion size ratio?

1. CsI
2. CsF
3. LiF
4. NaF

The correct order of the decreasing ionic radii among the following isoelectronic species is

1. Ca2+ > K+ > S2- > Cl-
2. Cl- > S2- > Ca2+ > K+
3. S2- > Cl- > K+ > Ca2+
4. K+ > Ca2+ > Cl- > S2-

Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl ?

1. Cl < F < O < S
2. O < S < F < Cl
3. F < S < O < Cl
4. S < O < Cl < F

Amongst the elements with following electronic configurations, which one of them may have the highest ionisation energy ?

1. [Ne] 3s2 3p2
2. [Ar] 3d10 4s2 4p3
3. [Ne] 3s2 3p1
4. [Ne] 3s2 3p3

Identify the correct order of the size of the following:

1. Ca2+ < K+ < Ar < Cl- < S2-
2. Ar < Ca2+ < K+ < Cl- < S2-
3. Ca2+ < Ar < K+ < Cl- < S2-
4. Ca2+ < K+ < Ar < S2- < Cl-

With which of the following electronic configuration an atom has the lowest ionisation enthalpy?

1. 1s2 2s2 2p3
2. 1s2 2s2 2p6 3s1
3. 1s2 2s2 2p6
4. 1s2 2s2 2p5

Which of the following is the most basic oxide?

1. SeO2
2. Al2O3
3. Sb2O3
4. Bi2O3